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How To Run A Python Job#

Introduction#

All members of a project in Hopsworks can launch the following types of applications through a project's Jobs service:

  • Python (Hopsworks Enterprise only)
  • Apache Spark

Launching a job of any type is very similar process, what mostly differs between job types is the various configuration parameters each job type comes with. After following this guide you will be able to create a Python job.

UI#

Step 1: Jobs overview#

The image below shows the Jobs overview page in Hopsworks and is accessed by clicking Jobs in the sidebar.

Jobs overview
Jobs overview

Step 2: Create new job dialog#

By default, the dialog will create a Spark job. To instead configure a Python job, click Advanced options, which will open up the advanced configuration page for the job.

Create new job dialog
Create new job dialog

Step 3: Set the script#

Next step is to select the python script to run. You can either select From project, if the file was previously uploaded to Hopsworks, or Upload new file which lets you select a file from your local filesystem as demonstrated below.

Configure program
Configure program

Step 4: Set the job type#

Next step is to set the job type to PYTHON to indicate it should be executed as a simple python script. Then click Create New Job to create the job.

Set the job type
Set the job type

Step 5 (optional): Additional configuration#

It is possible to also set following configuration settings for a PYTHON job.

  • Container memory: The amount of memory in MB to be allocated to the Python script
  • Container cores: The number of cores to be allocated for the Python script
  • Additional files: List of files that will be locally accessible by the application

Set the job type
Set the job type

Step 6: Execute the job#

Now click the Run button to start the execution of the job, and then click on Executions to see the list of all executions.

Once the execution is finished, click on Logs to see the logs for the execution.

Start job execution
Start job execution

Code#

Step 1: Upload the python script#

This snippet assumes the python script is in the current working directory and named script.py. It will upload the python script to run to the Resources dataset.

import hopsworks

connection = hopsworks.connection()

project = connection.get_project()

dataset_api = project.get_dataset_api()

uploaded_file_path = dataset_api.upload("script.py", "Resources")

Step 2: Create PYTHON job#

In this snippet we get the JobsApi object to get the default job configuration for a PYTHON job, set the python script to run and create the Job object.

jobs_api = project.get_jobs_api()

py_job_config = jobs_api.get_configuration("PYTHON")

py_job_config['appPath'] = uploaded_file_path

job = jobs_api.create_job("py_job", py_job_config)

Step 3: Execute the job#

In this snippet we execute the job synchronously, that is wait until it reaches a terminal state, and then download and print the logs.

# Run the job
execution = job.run(await_termination=True)

# Download logs
out, err = execution.download_logs()

f_out = open(out, "r")
print(f_out.read())

f_err = open(err, "r")
print(f_err.read())

API Reference#

Jobs

Executions

Conclusion#

In this guide you learned how to create and run a job.